diff --git a/pkgs/development/compilers/binaryen/default.nix b/pkgs/development/compilers/binaryen/default.nix
index 8542fd52d04f..d6c1442a8b8b 100644
--- a/pkgs/development/compilers/binaryen/default.nix
+++ b/pkgs/development/compilers/binaryen/default.nix
@@ -4,13 +4,13 @@
 
 stdenv.mkDerivation rec {
   pname = "binaryen";
-  version = "117";
+  version = "118";
 
   src = fetchFromGitHub {
     owner = "WebAssembly";
     repo = "binaryen";
     rev = "version_${version}";
-    hash = "sha256-QYJkrvwcUWbFV5oQdP11JuVmfOTYaFWGQGksboQ1d58=";
+    hash = "sha256-akMW3S2/qUyLK8F77EtnaXPDXvIMpkGfNB2jOD6hQho=";
   };
 
   nativeBuildInputs = [ cmake python3 ];
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/WebAssembly/binaryen";
     description = "Compiler infrastructure and toolchain library for WebAssembly, in C++";
     platforms = platforms.all;
-    maintainers = with maintainers; [ asppsa ];
+    maintainers = with maintainers; [ asppsa willcohen ];
     license = licenses.asl20;
   };
 
diff --git a/pkgs/development/compilers/emscripten/default.nix b/pkgs/development/compilers/emscripten/default.nix
index 2919a305e428..2d94880976d7 100644
--- a/pkgs/development/compilers/emscripten/default.nix
+++ b/pkgs/development/compilers/emscripten/default.nix
@@ -8,7 +8,7 @@
 
 stdenv.mkDerivation rec {
   pname = "emscripten";
-  version = "3.1.55";
+  version = "3.1.64";
 
   llvmEnv = symlinkJoin {
     name = "emscripten-llvm-${version}";
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
     name = "emscripten-node-modules-${version}";
     inherit pname version src;
 
-    npmDepsHash = "sha256-7tZEZ7NN1jJBHa9G5sRz/ZpWJvgnTJj4i5EvQMsGQH4=";
+    npmDepsHash = "sha256-2dsIuB6P+Z3wflIsn6QaZvjHeHHGzsFAI3GcP3SfiP4=";
 
     dontBuild = true;
 
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner = "emscripten-core";
     repo = "emscripten";
-    hash = "sha256-3SqbkXI8xn4Zj3bDLCegxslYH5m/PkF6n/pPfm5z5VA=";
+    hash = "sha256-AbO1b4pxZ7I6n1dRzxhLC7DnXIUnaCK9SbLy96Qxqr0=";
     rev = version;
   };
 
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
   patches = [
     (substituteAll {
       src = ./0001-emulate-clang-sysroot-include-logic.patch;
-      resourceDir = "${llvmEnv}/lib/clang/18/";
+      resourceDir = "${llvmEnv}/lib/clang/${lib.versions.major llvmPackages.llvm.version}/";
     })
   ];
 
@@ -51,9 +51,6 @@ stdenv.mkDerivation rec {
 
     patchShebangs .
 
-    # emscripten 3.1.55 requires LLVM tip-of-tree instead of LLVM 18
-    sed -i -e "s/EXPECTED_LLVM_VERSION = 19/EXPECTED_LLVM_VERSION = 18/g" tools/shared.py
-
     # fixes cmake support
     sed -i -e "s/print \('emcc (Emscript.*\)/sys.stderr.write(\1); sys.stderr.flush()/g" emcc.py
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 9dbd51473876..7f810836380b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7597,7 +7597,7 @@ with pkgs;
   easeprobe = callPackage ../tools/misc/easeprobe { };
 
   emscripten = callPackage ../development/compilers/emscripten {
-    llvmPackages = llvmPackages_18;
+    llvmPackages = llvmPackages_git;
   };
 
   emscriptenPackages = recurseIntoAttrs (callPackage ./emscripten-packages.nix { });